[E2E] PROMOTE TO BLOCKING: blob_index_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Data Stores When using elasticsearch API to search for a public blob finds blob that matches file content | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #469669 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-07-01 02:06:04 UTC)

qa/qa/specs/features/ee/api/9_data_stores/elasticsearch/index_tests/main_index/blob_index_spec.rb

@@ -23,7 +23,7 @@ module QA
       end
 
       it(
-        'finds blob that matches file content',
+        'finds blob that matches file content', :blocking,
         testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347632'
       ) do
         QA::Support::Retrier.retry_on_exception(